1.定义控件
先举一个纯文本的实例
let tags = ["理财","转让","预约"] as [Any]
let segmented = UISegmentedControl(items: tags)
segmented.layer.position = CGPoint(x: self.view.bounds.size.width/2, y: 100)
segmented.selectedSegmentIndex = 0//默认第一个被选中
self.view.addSubview(segmented)
定义控件
再举一个纯图片的例子，当然图片和文本可以一起用
let tags = [UIImage(named: "voice-")!,UIImage(named: "voice")!,UIImage(named: "voice+")!] as [Any]
图片items
2.添加事件
segmented.addTarget(self, action: #selector(segmentDidchange(_:)), for: .valueChanged)
@objc func segmentDidchange(_ sender: UISegmentedControl){
print("index:\(sender.selectedSegmentIndex); title:\(sender.titleForSegment(at: sender.selectedSegmentIndex))")
}
添加事件
3.添加和删除选项
let tags = ["理财","转让","预约"] as [Any]
let segmented = UISegmentedControl(items: tags)
segmented.layer.position = CGPoint(x: self.view.bounds.size.width/2, y: 100)
segmented.selectedSegmentIndex = 0//默认第一个被选中
segmented.addTarget(self, action: #selector(segmentDidchange(_:)), for: .valueChanged)
//添加文字选项
segmented.insertSegment(withTitle: "借款", at: 2, animated: true)
//添加图片选项
segmented.insertSegment(with: UIImage(named:"alarm")!, at: 3, animated: true)
//删除选项
segmented.removeSegment(at: 0, animated: true)
self.view.addSubview(segmented)
增删选项
4.修改选项文字和颜色
let tags = ["理财","转让","预约"] as [Any]
let segmented = UISegmentedControl(items: tags)
segmented.layer.position = CGPoint(x: self.view.bounds.size.width/2, y: 100)
segmented.selectedSegmentIndex = 0//默认第一个被选中
segmented.addTarget(self, action: #selector(segmentDidchange(_:)), for: .valueChanged)
//添加图片选项
segmented.insertSegment(with: UIImage(named:"alarm")!, at: 3, animated: true)
segmented.tintColor = UIColor.red
segmented.setTitle("理财", forSegmentAt: 1)
self.view.addSubview(segmented)
修改选项样式
5.保留图片颜色
上面一步操作图片的颜色也一起被设置成了红色（原本蓝色），大多数情况是不希望图片颜色被修改，可以通过下面的方法保留图片原来的颜色
segmented.setImage(UIImage(named:"alarm")?.withRenderingMode(.alwaysOriginal), forSegmentAt: 3)
保留图片原色
6.修改选项文本偏移量
segmented.setContentOffset(CGSize(width:3, height:2), forSegmentAt: 1)
修改偏移量
可以把值设置为负数
segmented.setContentOffset(CGSize(width:-3, height:2), forSegmentAt: 1)
修改偏移量1
使用Segmented Control实现多个View切换
1.实现原理
通过不同view的偏移量来实现view的切换
2.先定义两个简单的view
FirstView.swift
import UIKit
class FirstView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.green
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
label.text = "第一个Segment"
label.textColor = UIColor.black
self.addSubview(label)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
SecondView.swift
import UIKit
class SecondView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.yellow
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
label.text = "第二个Segment"
self.addSubview(label)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
3.实现view加载
import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
var segmented: UISegmentedControl!
var scrollView: UIScrollView!
var firstView : FirstView!
var secondView: SecondView!
var width: CGFloat!
var height: CGFloat!
override func viewDidLoad() {
super.viewDidLoad()
let tags = ["理财","转让"] as [Any]
width = self.view.bounds.size.width
height = self.view.bounds.size.height
segmented = UISegmentedControl(items: tags)
segmented.layer.position = CGPoint(x: self.view.bounds.size.width/2, y: 50)
segmented.selectedSegmentIndex = 0//默认第一个被选中
segmented.addTarget(self, action: #selector(segmentDidchange(_:)), for: .valueChanged)
self.view.addSubview(segmented)
scrollView = UIScrollView(frame: CGRect(x: 0, y: 80, width: width, height: height - 80 ))
scrollView.delegate = self
scrollView.isPagingEnabled = true
scrollView.contentSize = CGSize(width: width * 2, height: height - 80 )
self.view.addSubview(scrollView)
firstView = FirstView(frame: CGRect(x: 0, y: 0, width: width, height: height - 80))
scrollView.addSubview(firstView)
//第二个view的x坐标是从屏幕的宽度开始
secondView = SecondView(frame: CGRect(x: width, y: 0, width: width, height: height - 80))
scrollView.addSubview(secondView)
}
@objc func segmentDidchange(_ sender: UISegmentedControl){
if sender.selectedSegmentIndex == 0 {
scrollView.contentOffset.x = 0
}else{
scrollView.contentOffset.x = width
}
}
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.view.endEditing(true)
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
if scrollView.contentOffset.x >= width {
segmented.selectedSegmentIndex = 1
}else{
segmented.selectedSegmentIndex = 0
}
}
}
用例
上面实现的效果也可以通过滑动底部的view来切换view，截屏的时候忘了演示
上面讲述了UISegmented Control基本的用法，以及其在具体应用中的一个实例，当然上面的例子这种实现方式只是此类功能的一种实现思路，小伙伴们可以搜集一些资料，寻找一些功能性更强，效果更优美的实现方式。
